regex101: PCRE (Legacy) Match Workspace

Pro

(?sm)applies the following effective flags to the remainder of the pattern: gsm

s modifier: single line. Allows a dot to match line terminators

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

^start of line

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Non-Capturing Group(?:(?!^0).)*?

*?repeats the group contents below any number of times:

Negative Lookahead(?!^0)

^start of line

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

.any character

Non-Capturing Group(?:kryptonite|stalagmite)

1st Alternativekryptonite

kryptonitethe literal text kryptonite (case sensitive)

2nd Alternativestalagmite

stalagmitethe literal text stalagmite (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

25 tokens

Regular Expression

(?sm)^0(?:(?!^0).)*?(?:kryptonite|stalagmite)

New

00:20314 lorem ipsum
  want this
  kryptonite

00:02314 quux
  padding
  dont want this

00:03124 foo
     neither this

00:01324 foo
     but we want this
     stalagmite

00:02134 tralala
     not this

00:03124 bar foo
     and we want this
     kryptonite but not this(!)

00:02134 foo bar
     and not this either

00:01234 dolor sit amet
     EOF

Substitution

00:20314 lorem ipsum
  want this
  kryptonite

00:02314 quux
  padding
  dont want this

00:03124 foo
     neither this

00:01324 foo
     but we want this
     stalagmite

00:02134 tralala
     not this

00:03124 bar foo
     and we want this
     kryptonite but not this(!)

00:02134 foo bar
     and not this either

00:01234 dolor sit amet
     EOF